Multiply Two 8 Bit Numbers by Successive Addition Method
Write a Program to Multiply Two 8 Bit Numbers Successive Addition Method in Assembly language . Program should take first number and counter as input for the program and after implementing given below logic it should produce desired result .
Consider that a byte is present in the AL register and second byte is present in the BL register.
We have to multiply the byte in AL with the byte in BL.
We will multiply the numbers using successive addition method.
In successive addition method, one number is accepted and other number is taken as a counter. The first number is added with itself, till the counter decrements to zero.
Result is stored in DX register. Display the result, using display routine.
For example : AL = 12 H, BL = 10 H
Result = 12H + 12H + 12H + 12H + 12H + 12H + 12H + 12H + 12H + 12H
Result = 0120 H
Algorithm to Multiply Two 8 Bit Numbers Successive Addition Method
Step I : Initialize the data segment.
Step II : Get the first number.
Step III : Get the second number as counter.
Step IV : Initialize result = 0.
Step V : Result = Result + First number.
Step VI : Decrement counter
Step VII : If count ¹ 0, go to step V.
Step VIII : Display the result.
Step IX : Stop.
Program to Multiply Two 8 Bit Numbers Successive Addition Method
.model small
.data
a db 12H
b db 10H
.code
mov ax, @data ; Initialize data section
mov ds, ax
mov al, a ; Load number1 in al
mov bl, b ; Load number2 in bl
mov ah, 0
mov dx, 0 ; intialize result
ad: add dx, ax ; add numbers. Result in dx
dec bl ; dec number
cmp bl, 0 Flowchart 11
jnz ad
mov ch, 04h ; Count of digits to be displayed
mov cl, 04h ; Count to roll by 4 bits
mov bx, dx ; Result in reg bx
l2: rol bx, cl ; roll bl so that msb comes to lsb
mov dl, bl ; load dl with data to be displayed
and dl, 0fH ; get only lsb
cmp dl, 09 ; check if digit is 0-9 or letter A-F
jbe l4
add dl, 07 ; if letter add 37H else only add 30H
l4: add dl, 30H
mov ah, 02 ; Function 2 under INT 21H (Display character)
int 21H
dec ch ; Decrement Count
jnz l2
mov ah, 4cH ; Terminate Program
int 21H
end
How to Run this Program
For Running this program you should have installed Tasm on you computer . If you have not installed Tasm yet please install from Here .
C:\programs>tasm succmul.asm
Turbo Assembler Version 3.0 Copyright (c) 1988, 1991 Borland International
Assembling file: succmul.asm
Error messages: None
Warning messages: None
Passes: 1
Remaining memory: 438k
C:\programs>tlink succmul
Turbo Link Version 3.0 Copyright (c) 1987, 1990 Borland International
Warning: No stack
C:\programs>succmul
0120
pratham says
upload more programs on 8086 microprocessor assembly language plzzz
ProjectsGeek says
Sure. We are working on 8086 microprocessor assembly language programs. Please check other codes here.
https://projectsgeek.com/assembly-language-codes